Update Help Text

README.md

@@ -1,18 +1,25 @@
 # Unlock Music Project - CLI Edition
+
 Original: Web Edition https://github.com/ix64/unlock-music
+
 - [Release Download](https://github.com/unlock-music/cli/releases/latest)
 
 ## Features
+
 - [x] All Algorithm Supported By `ix64/unlock-music`
 - [ ] Complete Cover Image
 - [ ] Parse Meta Data
 - [ ] Complete Meta Data
 
 ## Hou to Build
+
 - Requirements: **Golang 1.16**
 
 1. Clone this repo `git clone https://github.com/unlock-music/cli && cd cli`
 2. Build the executable `go build ./cmd/um`
 
 ## How to use
+
+- Drag the encrypted file to `um.exe` (Tested on Windows)
+- Run: `./um [-o <output dir>] [-i] <input dir/file>`
 - Use `./um -h` to show help menu

cmd/um/main.go

@@ -12,13 +12,12 @@ import (
 	"github.com/unlock-music/cli/internal/logging"
 	"github.com/urfave/cli/v2"
 	"go.uber.org/zap"
-	"log"
 	"os"
 	"path/filepath"
 	"strings"
 )
 
-var AppVersion = "0.0.3"
+var AppVersion = "0.0.4"
 
 func main() {
 	app := cli.App{
@@ -27,23 +26,36 @@ func main() {
 		Usage:    "Unlock your encrypted music file https://github.com/unlock-music/cli",
 		Version:  AppVersion,
 		Flags: []cli.Flag{
-			&cli.StringFlag{Name: "input", Aliases: []string{"i"}, Usage: "path to input file or dir", Required: true},
+			&cli.StringFlag{Name: "input", Aliases: []string{"i"}, Usage: "path to input file or dir", Required: false},
-			&cli.StringFlag{Name: "output", Aliases: []string{"o"}, Usage: "path to output dir", Required: true},
+			&cli.StringFlag{Name: "output", Aliases: []string{"o"}, Usage: "path to output dir", Required: false},
 		},
+
 		Action:          appMain,
-		Copyright:       "Copyright (c) 2020 Unlock Music https://github.com/unlock-music/cli/blob/master/LICENSE",
+		Copyright:       "Copyright (c) 2020 - 2021 Unlock Music https://github.com/unlock-music/cli/blob/master/LICENSE",
 		HideHelpCommand: true,
-		UsageText:       "um -i /path/to/input -o /path/to/output/dir",
+		UsageText:       "um [-o /path/to/output/dir] [-i] /path/to/input",
 	}
 	err := app.Run(os.Args)
 	if err != nil {
-		log.Fatal(err)
+		logging.Log().Fatal("run app failed", zap.Error(err))
 	}
 }
 
 func appMain(c *cli.Context) error {
 	input := c.String("input")
+	if input == "" && c.Args().Present() {
+		input = c.Args().Get(c.Args().Len() - 1)
+	}
+
 	output := c.String("output")
+	if output == "" {
+		var err error
+		output, err = os.Getwd()
+		if err != nil {
+			return err
+		}
+	}
+
 	inputStat, err := os.Stat(input)
 	if err != nil {
 		return err